I just installed a Two Brothers slip-on VALE exhaust on my 2006 GSXR 600. The bike started popping or back-firing during rapid deceleration. I thought it was caused by running to lean/rich. I installed a power commander 3 tonight and downloaded the appropriate map according to the software. It didn't solve the problem, and I don't want to ruin the engine. Any suggestions besides paying the $300 down at Dynajet?

This sounds incredibly familiar...

Yeah, you're running lean. A power commander can help out some, but it won't completely fix the problem. And as far as I know, every bike is different, so downloading a map won't be completely accurate. If/when you want to get it properly mapped, give Steve at Las Vegas Dynotech a call.

BTW, I've been running an 06 GXXR 600 with a Two Brothers slip-on and no Power Commander for almost a year. It backfires like crazy, but I'm still going fine. I heard the spark plugs don't last as long and I think you may be running a risk of burning some valves, but hey, I'm no expert. Anyone else out there, feel free to correct me where I'm wrong.

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'06 GSX-R 600

Yup, I ride a Yamaha FZ6 with aftermarket slip ons (Remus) and my bike pops all the time when I downshift. As another member mentioned, the bike is running lean. I've also got a K & N filter installed, which did not stop the popping. I also have a PC3, but have not installed it just for the reason you mentioned, so I want it Dyno tuned correctly

Now since I have joined this forum, I hope to find out who this Steve guy is?

I've logged over 10,000 miles with the slip ons, nothing bad yet, nor I expect anything bad to happen either.

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VEGASRIDER................
Team Yamaha Blue '06 FZ6!

Steve is the Owner of Las Vegas Dynotech, located at the Las Vegas Speedway. He has a dyno in his shop and is a good guy and a friend of SCS.

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SCS SGT @ ARMS '09
FORMER SGT @ ARMS VKMC
WWGD

FTLR

I am the "DEAD FINGER"

Marcus and atc your bike and mine backfires because of the pair valve. You can either remove it or disable it to stop the popping. hit me up for more info on that...

put 30k miles on my shorty exhaust, changed the plugs 3 times since ive owned the bike. manual says 7500 miles, might start doing it a lil more often, but other then that no probs..

I would recommend gettin a pc3 and tuning though as soon as you can to benefit from your new exhaust and get the max out of your bike.

Steve is the best for the job, las vegas dyno tech is his shop name. You can reach him

Las Vegas Dyno Tech (702) 644-9412 6947 Speedway Blvd, #S101, Las Vegas, NV

Tell em scs sent ya!

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7+ year member - and still going.

"Sin City Sportbikes was founded by Las Vegas sport bike enthusiasts in response to a desire to promote a positive and safe image of the sport. Riders and enthusiasts from all over the Las Vegas Valley have joined together in an effort to give back to a community that has helped and nurtured us. "

-Sin City Sportbikes

THANKS, since there isn't a thanks tab on this fourm.

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VEGASRIDER................
Team Yamaha Blue '06 FZ6!

thats all i need brotha =D

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7+ year member - and still going.

"Sin City Sportbikes was founded by Las Vegas sport bike enthusiasts in response to a desire to promote a positive and safe image of the sport. Riders and enthusiasts from all over the Las Vegas Valley have joined together in an effort to give back to a community that has helped and nurtured us. "

-Sin City Sportbikes

Agreed....it's probably your PAIR valve system shooting nice cool air into your hot exhaust tubes, creating a nice backfire, especially on decel....

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"There's too much evil in the world, it will never take a day off, how can I?"
eNVy MotorSportz -Everything on wheels!

ed at motocafe can get dyno jet to custom map bikes for between 150 and 200 dollars... dyno jet makes the pc3... seemed more logical an option for tuning to me...

also, the maps that come on the disc are STOCK setup maps... theyll work better than not tuning, i suppose, but in the long run, you need to tune.





no offense to the dyno tech guy, ive heard a lot of great stuff about him.

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thanks for all the feedback guys. See you on the hump run today.....

If you watch the WSBK sometimes you'll actually see flames shoot out their pipes when engine braking hard. As mentioned above, it's the PAIR valve. I wouldn't worry too much about it, besides we all put pipes on cause the exra noise, right?

Oh, I wasn't complaining. The only reason I like riding in the cold is cause it's easier to make it backfire.

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'06 GSX-R 600